Retain banking, also known as relationship banking, aims to build strong relationships with customers to ensure their continued business and support. This helps banks retain existing customers and attract new, long-lasting customers. Building loyalty through good customer service is key, as it creates rapport and trust, retaining customers for life. Data analysis can identify the most profitable customers to focus retention efforts on, while also improving services based on feedback from defecting customers. Relationship banking treats banking as an ongoing process rather than a series of isolated events to develop high customer satisfaction and loyalty over the long term.